Grow a garden showstopper with Mammoth Grey Stripe Sunflower Seeds. This classic heirloom sunflower variety produces towering plants with enormous golden-yellow flower heads that can reach over 12 inches wide. Known for its impressive height, abundant seeds, and wildlife appeal, Mammoth Grey Stripe is a favorite among gardeners, children, and pollinator enthusiasts.

Perfect for creating a dramatic garden backdrop, privacy screen, or attracting birds and bees, these giant sunflowers thrive in sunny locations and are easy to grow from seed. The large striped sunflower seeds are also enjoyed by birds and can be harvested for snacks when properly prepared.

Plant Details

• Botanical Name: Helianthus annuus
• Common Name: Mammoth Grey Stripe Sunflower
• Plant Type: Annual Flower
• Bloom Color: Golden Yellow
• Plant Height: 8–12 feet
• Flower Head Size: Up to 12 inches+
• Light Requirements: Full Sun
• Soil: Well-drained, fertile soil
• Bloom Season: Summer to Fall
• Uses: Pollinator gardens, cut flowers, bird gardens, garden borders

Why Grow Mammoth Grey Stripe Sunflower Seeds?

• Giant Garden Impact: Creates impressive towering blooms that stand out in any landscape.
• Pollinator Friendly: Attracts bees, butterflies, and beneficial insects.
• Bird Favorite: Produces large seeds loved by birds and wildlife.
• Easy to Grow: Fast-growing annual perfect for beginner gardeners.
• Great for Kids & Family Gardens: A fun way to experience growing giant flowers.

Growing Tips

• Direct sow outdoors after the danger of frost has passed.
• Plant seeds ½–1 inch deep in fertile, well-drained soil.
• Space plants 18–24 inches apart for strong growth.
• Choose a location with 6–8 hours of direct sunlight daily.
• Water regularly during early growth and flowering.
• Provide support in windy areas as plants can become very tall.

Germination: Approximately 7–14 days under ideal conditions.
Days to Maturity: Around 90–100 days.

❓ Frequently Asked Questions (FAQ)

How tall do Mammoth Grey Stripe Sunflowers grow?
These giant sunflowers can grow approximately 8–12 feet tall under ideal growing conditions.

When should I plant Mammoth Grey Stripe Sunflower seeds?
Plant outdoors after the last frost when soil temperatures are warm, usually in late spring.

Can I harvest the sunflower seeds?
Yes! Mature sunflower heads produce large striped seeds that can be harvested for birds or food use.

Do Mammoth Grey Stripe Sunflowers attract pollinators?
Yes. Their large blooms attract bees, butterflies, and other beneficial insects.

Can I grow these sunflowers in containers?
Due to their large size, they perform best in garden beds, but dwarf containers may support young plants.

Where to Buy Mammoth Grey Stripe Sunflower Seeds for Sale?
At Seed World, we offer fresh Mammoth Grey Stripe Sunflower Seeds with fast U.S. shipping. Grow giant sunflower blooms that bring beauty, pollinators, and wildlife to your garden.

Pros and cons

• Flowering
• Edible